Poppet valve for internal-combustion engines



B.S.ARNOLD, POPPET VALVE FOR INTERNAL COMBUSTION ENGINES. APPLICA'HON FILED JUNE 13, I921. 1 z SEeA? e MMHM Aw w M53??? 2 Patented Nov, 7, 19225.,

ATENT OFFIEZ.

BENJAMIN S. ARNOLD, 0F SYRACUSE, NEW YORK.

POPPET VALVEv FOR INTERNAL-COMIBUSTIO N ENGINES.

Application filed'June 13, 1921 Serial No. 477,251.

and useful Improvements in Poppet Valves for Internal-Combustion Engines, of which the following, takenbin connection with the accompanyin drawings, is a full, clear, and exact description.

This invention relates to a poppet valve for internal combustion engines in which a coil spring surrounding a portion of the valve stem is normally compressed between a portion of the engine frame, and a washer on the valve stem and employed to automatically close the valve after being operated upon by a suitable cam shaft.

These washers are usually held in operative position upon the valve stem against the action of the spring by means of a pin slidable diametrically through an opening in said stem and must be entirely removed to release the tension of the spring and permit the removal of the valve when desired for clean ing, grinding or for any other purpose.

These pins are necessarily very small usually about an eighth of inch in diameter and about three-quarters of an inch long,

and owing to the compact relation of the valves and spring to the frame and other parts of the engine and also to the fact that some sort of lifting instrument must be employed to raise the washer against the action of the spring to permit the removaland re placement of the pins, it is found to be ex tremely difiicult to effect this removal and replacement of the pins without frequently dropping and losing them in the under-lying parts of the machine resulting in a considerable loss of time in recovering or replacing said pins,-and the main object of my present invention is to incorporate the washer holding means in and upon the valve stem as a permanent part thereof, and at the same time to permit it to be readily adjusted by hand toand from its holding position whereby when the washer is lifted against the action of the spring to relieve pressure upon the holding device, the latter may be turned to assume a position lengthwise of the valve stem, thus permitting the valve 'with the holding means thereon to be removed with the assurance that it will not become displaced from the valve stem and that when the valve is reassembled, the holding device may be easily and quickly adjusted to its llOlCllIlg' position, 1

Other objects and uses relating to specific parts of the device will be brought out in the following description:

In the drawings:

Fig. 1 is an elevation partly in section of a valve embodying the features of my invention in operative position.

Fig.2 is a side elevation of a lower portion of the valve stem.

Fig. 3 is a transverse sectional view taken on line 33, Fig. 1.

In order that my invention may be clearly understood, 1 have shown a portion of a valve -1 having its stem 2- guided in a portion of the engine frame as 3-- and provided at its lower end with a longitudinally elongated and diametrically extending slot l for receiving a locking-member 5 which is pivoted at -6- to the walls of the slot to swing vertically.

One end as 7 of a locking member 5- is weighted preferably by making it of greaterradial length than the opposite side to cause the locking member to automatically assume a position lengthwise of and within the slot 4L when the washer as 8 is lifted out of engagement there with against the action of a retracting spring -9 which is interposed between the washer -8 and adjacent portion of the frame --3-'.

Thewasher 8 and spring 9- are of the usual construction commonly employed in connection with the valves of internal combustion engines of the L-type for causing the valve to close against its seat after being open by a camshaft not shown.

The locking-member 7- serves as an abutment on the valve stem againstwhich the washer 8 is held by the spring 9- to cause the spring to function properly in automatically closing the valve and is permanently connected to the valve stem by the pivot -6- so that when it is desired to re move the valve for cleaning or other purposes,it is simply necessary to apply a suit able lifting device to the under side of the washer -8 to lift the same against the action of the retracting spring 9 out of wholly within the slot 4-, after which the a valve may be withdrawn upwardly through the opening in the washer 8- and re moved from the engine if. desired or the washer may be released of its lifting means and allowed to be forced downwardly by thespring 9 to permit the valve to be freely rotated, against its, seat for grinding, pun-i;

' washer at opposite sides of the valve stem.

poses. I I -v The locking member or movable abutment 5- preferably consists of a flatpieceof hardened steel of considerably, lesszthickness than the diameter of the valve stem:r2, while the slot l corresponds in thick-V ness and length to the thieknessand length of the abutment 5., although it is Sufficiently longerto permit the abutment to rock freely therein and lengthwise thereof, it

being understood that the width of: the

abutment or locking-member is ofabout the same diameter; as the diameter of the valve stem and that the pivot ---6., is disposed in the longitudinal center, of the valve stem to permit the lockingvmember -5 to pass through the hole in the washer 8 when adjusted lengthwise ofthe, valve 1 stem. v It will also be observed that the distance between the pivot 6 and lower end of the: slot 4- is slightly greater than the dis- 7 engagement from the under side of the:

washer 8. I l p v v- In order that the locking-member or abutmerit 5- may be easily and quickly turned from its lengthwise position; to a crosswise position by hand while the valveis in operative position, portions of the opposite sides of the valve stem below the pivot.6- and slightly below the lower end wall of the slot -4 are provided with recesses -10- for receiving the ends ofthe fingers by which the weighted end of the locking-member maybe pushed or pulled laterally a suilicient distance to permit it to be engaged by the fingers and adjusted to its cross-wise position after the Washer has been lifted some distance above the upper end of the slot against the action of they spring -9, whereupon the washer may be released to allow the spring to force said washer downwardly against the upper edge of the locking-member, thereby establishing I a proper connection between the spring and r valve for the work-operation thereof.

What I claim is: 1, In combination with a relatively sta- 2.. In combination with .a relatively stationary part-of an internal combustion en gine .havinga guide-opening therein, a "pop-Y pet valve having a stem-slidable endwise in the guide-opening, said valve stem haw, ing a-Hdiametrically, extending slot therethrough, a washer encircling the. valvestenn a coil spring encircling the valve stem and normally compressed between the washer and relatively stationarypart of the en-' gine, an abutment'pivoted to the valve stem to swin in said slot from aposition length-1 wise o. the stem to across-wise position: and vice. versa for engaging the outer faceof the washer at both sides of -the valve stem when in its cross-wise position.

3. .Invcombination with a relatively stationary part 1 of an internal combustion engine-having a guide-opening therein, a poppet valve having a: stemslidable endwise in the. guide-opening, said valvestem having a diametricallyextending slot therethrough, a washer,- encircling the valve stem, acoil spring encirclingthe valve stem and normallycompre'ssed betweenv the washer and relatively; stationary part ofthe' engine, an:

; abutment pivoted to the valve stem to swing in said slot from a position lengthwise of: thestem to a cross-wise positionvand vice versa. for; engaging the outer face or the washer at both sides of the valve stemllo when in its cross-wise position, said abutment-havingaoneend weighted to cause it to assume a lengthwise position when" the washer is released from engagementthere-r 4. In combination with a relatively stationary partof an internalcombustion ens gine having a guide-opening therein, a pop-v pet valve having a stem, slidable endwise in the guide-opening, said valve stemihaving a diametricall extending slot therethrough, a washer encircling the valve stemy acoil spring encircling the valve-stem and normally com-pressed between; the washer and relatively stationary art of the engine, an abutmentpivoted to the valve stem to swing in said slot from a position lengthwise of V the stems-to, a cross-wise position and vice In Witness whereof I have hereunto set my hand this 7th day of June, 1921.

B. S. ARNOLD.

Witnesses:

HOWARD P. DENISON, E. M. FRADEN URGH, 

